Question

As a muscle cell undergoes an eccentric contraction, sarcomere length will ________ as the length of the A band ________.

Answer 1

During an eccentric contraction of a muscle cell, sarcomere lengthens while the length of the A band remains the same.

Step-by-step explanation:

During an eccentric contraction of a muscle cell, the sarcomere lengthens while the length of the A band remains the same.

Let's understand this further:

• The sarcomere is the basic contractile unit of a muscle.
• The A band is the region within the sarcomere that contains thick filaments of myosin.
• During an eccentric contraction, the muscle lengthens as it generates force while being stretched.
• However, the length of the A band does not change, even though the sarcomere lengthens.

Therefore, sarcomere length increases and the A band remains the same during an eccentric contraction.